My father was Walter William Athey (1897-1963). His father was Charles William Athey (1869-1924) who had one brother Arthur E. Athey (1872-1935). Charles William Athey married (1894)Mathilda Emilie Schaplow, daughter of Karl Schaplow and Henrietta Wilhelmina Welk (married in Brandenburg, Germany in 1869).
Charles William Athey's father was William C. Athey who is thought to be connected to the Eastern and Indiana branches of Atheys. This is as far as I've been able to connect the dots. Can anyone help me with this mystery?